/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.streaming.connectors.elasticsearch.table;

import org.apache.flink.annotation.Internal;
import org.apache.flink.configuration.ReadableConfig;
import org.apache.flink.table.api.ValidationException;

import org.apache.http.HttpHost;

import java.util.List;
import java.util.stream.Collectors;

import static org.apache.flink.streaming.connectors.elasticsearch.table.ElasticsearchOptions.HOSTS_OPTION;

/**
 * Elasticsearch 7 specific configuration.
 */
@Internal
final class Elasticsearch6Configuration extends ElasticsearchConfiguration {
	Elasticsearch6Configuration(ReadableConfig config, ClassLoader classLoader) {
		super(config, classLoader);
	}

	public List<HttpHost> getHosts() {
		return config.get(HOSTS_OPTION).stream()
			.map(Elasticsearch6Configuration::validateAndParseHostsString)
			.collect(Collectors.toList());
	}

	/**
	 * Parse Hosts String to list.
	 *
	 * <p>Hosts String format was given as following:
	 *
	 * <pre>
	 *     connector.hosts = http://host_name:9092;http://host_name:9093
	 * </pre>
	 */
	private static HttpHost validateAndParseHostsString(String host) {
		try {
			HttpHost httpHost = HttpHost.create(host);
			if (httpHost.getPort() < 0) {
				throw new ValidationException(String.format(
					"Could not parse host '%s' in option '%s'. It should follow the format 'http://host_name:port'. Missing port.",
					host,
					HOSTS_OPTION.key()));
			}

			if (httpHost.getSchemeName() == null) {
				throw new ValidationException(String.format(
					"Could not parse host '%s' in option '%s'. It should follow the format 'http://host_name:port'. Missing scheme.",
					host,
					HOSTS_OPTION.key()));
			}
			return httpHost;
		} catch (Exception e) {
			throw new ValidationException(String.format(
				"Could not parse host '%s' in option '%s'. It should follow the format 'http://host_name:port'.",
				host,
				HOSTS_OPTION.key()), e);
		}
	}
}
